Grinding machine



Feb. 27, 1940.` R KOSTER 2,191,617

GRINDING MACHINE Filed May 1l, 1938 2 Sheets-Sheet 1 11111 'lllllllllll nN'vsN-ror?. Paul Kos-fer.

AT1-onrust 'Feb. 2,7, 1940. I

P. KOVSTER GRINDING MACHINE Filed Mfay 1v1, 1938 2 Sheets-Sheet 2 yPatented Feb. 1940 UNITED STATES Y GRINDING MACHINE f Pal .Kostenlarial France g Application May 11, 1938, Serial No. 207,207 4In France May 14, 193.7

v 'i f6 claims. (C1. 51-2411' Rectifying machines with planetary movement are already known which are usedy particularly as rectiflers for valve seats, but these machines. rhave the inconvenience of vbeing `heavy since lthey "5- enclose the motor actuating or driving the grinder, and also theinconvenience vnone .the lessimportant Vof being given a rotary vibratory movement inthe hands of the operator.` n Such move- .ment can therefore occasion defectsin the recti- '10 i'lcation or` trueing up andis :verytiring for Vthe operator. v v

The presentinvention has for vobject to overcome these objections by providing a trueing up `machine with planetary movement one of the 115 Acharacteristicfeatures of whichresidesin that the trueing up system with planetary movement is movable in a casing'zcomprising handles for manipulating. and guiding the `machine and which, during the operation of the .lattenremains 20 immovable and insensibleto .the yreactions of :the planetary movement thus causing no .shock to the hands .of the operator.

The machine isfurther characterisedin that .its ,movement can be communicated .to it byl a 25 transmission such las a'flexible :shaft or by a transmission vwith cardan shaft or even directly by an electric motoror by any other mechanical, electrical, pneumatico-r hydraulic means of suitablekind. n can Various 'other featuresy will become evident from the following description with reference to the accompanying drawings which show:

Fig. 1 an elevation cfa .rectifying machine constructed according to the invention shown in par- 3'5 tial section;

Fig. 2 the same machine in plan view with part section, the mechanism being sectioned .along v,the line 2-2 of Figure 1. v

In a constructional form of the subject of the 40 invention, given by-way a simple example in no i v way limiting, the machineconsists as follows.:

' In a casing I areprovided :two bearings 2 and 3 alignedone upon the other and formed, the first one by a ball bearing and the second one .45 either byy a ball bearingor '.by a ring of .bronze or any other material.

In these bearings can rotate a `hollow main shaft 4 preferably hollow and having Journals 4a and 4p -corresponding'to the bearings. ".Ihese 50 journals 49.,.41 are `concentric to the axis of the central bore of the shaft,v and placed on the same line, they turn round in thecasing I.. `All the other external parts of the shaft arefconcentric vinrelation toa second axis and' are, inconse- 5.5l vquence, eccentric in relation to therst-axls. 1

The lower part of the shaft 4 is conical and receives :a :pinion wheel 5 provided-with a .spindle maintained yon the shaft by two stop rings 6 land ,'I.. This varrangement allows for taking up the play between the shaft and the pinion .wheel 5 which must nevertheless rotate freely on the latter.

On the hollow shaft of the pinion 'Wheel 5 is `screwed a cup 8 bearing on a conicalbearing surface provided at 590n the ysaid shaft. In the 10 -bowl or cup 8 is secured the grinder 9.

'On' the part .of the shaft 4 situated between the two bearing surfaces or journals 49. andf41tv .is provided a frame Il) havinga shaft comprising 'on the one hand'two sleeves lila and Ib surround- ."15 ing the shaft 4 and a shaft [Ic perpendicular to v:the axis of the sleeves. The frame comprises in addition an arm IllaV (Fig. 2) carrying a small .stationary shaft Il on which can rotate an` endlessscrew4 I2 integral with a pinion wheel I3. 20.

This screw and this pinion wheel can, for example, be formed in a single piece. They turn loose on the stationary shaft II- and are held vthereon by a stop ring I4.

The endless screw I2 .meshes with a wheel I5 25 with endless screw fast von the main shaft 4 byv means of a grub or like screw I6.

On the casing 'I are-screwed two hollow handlesl'landl8. l f

In the handle I1 is fitted a socket I9 pivoting 30 on two axes 20 parallel to the axis of the boreof the shaft 4. In this socket I9, can freelyslide the shaft 2Ia of a large shaftedpinionwheel 2I meshing with the grinder carryingfpinion wheel 5.

The shaft 2 Is is hollow and receives internally, 35 on the one hand, the shaft Ic of the vframev I0 and, von the other hand, the extremity of a flexible driving cable connected to an electric motor.`

On the shaft 2Ia is fast a small pinion wheel 22 meshing with the pinion wheel I3 of the end- 2,40 less screw I2. q

The shafted frame IIL'thelmainI shaft 4 and the Wheel with the endless screw form a mounted assembly. f

l`The ball bearing 2 is secured on 4the main F45.Y

shaft 4 .by two screw threaded rings 23, 24 and on the casing by a small bridge 25 secured to the latter by means of `several screws.

This bridge 25 is surmounted with a socket 25s in which can ymove a .micrometer screw 25 .15,0 the extremity of which is, in `case of emergency, intended to bear on the upper face of a centering and guiding rod 21 introduced into the guide .of the valve to be trued.l y v Owing `to the immobility .of its f rame it .is pos- .55

sible to support the machine, contrarily to the hitherto existing machines of the same kind, by a fixed support provided with means for axial sliding movement and arranged in a suitable position for insuring the right position of the grinder with regard to the valve to be rectified. In case of no use being made of such a support, it will be suicient, for placing the machine appropriately, to use the ,centering rod 21 situated in the Away above stated, q. i

The working of'the machine is then as follows: After suitably disposing the machine, Vitl-is possible, either by means of an axial shifting'of its support, or by the micrometric screw26,.`.to move nearer or further apart the grinder Stoor from the seat of the valve to be trued up 'accordingly as one turns the screw...in' one .'or other.'

direction. This adjustment being completed, the large shafted toothed or pinion wheel 2| is se Y going by means of the flexible drive.

F'rom this moment, two diiferent movements whichfare combined together, take place:

`1. The .very rapid rotation movement of the grinder through the intermediary of the grinder holder 5 andthe hollow shafted pinion wheel 2l.

'2. Theislow translatory movement of the complete mounted assembly consisting of the frame iii, shaftli and the wheel of the endless screw 6, 'whichkmovement is communicated to the'said wheel bythe endless screw l2 :which itself receives its rotary movement from the pinionfwheels i3 and 22 and the hollow shaft 25a' of the pinion wheel 2l. i

The grinder, through'the intermediary of the small shafted/pinion wheel A5,- the large pinion fwheel 2l andthe flexible' drive therefore rotates about the main shaft l which shaft is itself driven but preferablyl in the .reverse direction of rotation, by the mounted assembly above mentioned.

In this way there .is obtained the planetary ymovement but during ywhich vit will be observed -that the shafted frame' IU receives two different movements 1. An alternate longitudinal movement in the direction of the arrows f and f of Fig. 1 byslidving-in the pivotal socket i9; i

2. An alternate angular Imovement in the direction of the arrows f and f" of Fig. 2 by pivoting on the axes 261.

ThegrinderQ then receives an eccentric movement around the guiding rod 2 Without the operator feeling the slightestfdisplacement in holding the machine by its fhandles.-v I Y 'It is obvious that themodications of shape and detail vcan be embodied in the machine hereinabov'el described without thereby exceeding the spirit of the invention, said machine being applicable to other purposes than the trueing up of valvesy i What I claim is:4 v

l. in a machine for rectifying motor valve seats, comprising a grinder performing a rapid rotary 'movement and besides a slow movementdeccentric with regard to the valve seat axis, a casing provided with'handles, vbearings in said casing', a main shaft'journa'lled in said bearings, meansto drive said main shaft with slow rotaryrnovement concentric with said-bearings, two eccentric portions on vsaid main shaft, a grinder support mounted on one of said eccentric portionsgneans to drive said grinder support with a rapid rotary movement, ak partl to carry the means *driving said' Vshaft and 'said-grindersuppora said part being. mounted 011 merecera ,eccentric Portion ofsaid sh'aftyto permit'of 'driving bothA said 4'means a casing, bearings in said casing, ya; main shaft driving shaft.A

withv regard'tothe axis'ofrotation of "said main as Well as the grinder with a movement'eccentric with regard to the axis of rotation of the said shaft so as to ensure immobility of the casing of the machine during rectification and to permit of mounting said casing on axed support. I 5 2. In a machine for rectifying motor valve seats, comprising a grinder performing a rapid rotary movement and also a slow movement eccentric with regard to the axis of thevalve seat,

l0 journalled in said bearings, meansj to drive said shaft with a slow -rotary movement eccentric with said bearings, two eccentric portions on said" rshaft, a grinder support mounted on one of said t eccentric portions, means to drive said grinder support with a rapid rotary movement, a part to carry the means driving the said shaft and the said grinder, mounted on the second of said eccentric portions, said part comprising a frame provided with two sleeves traversed bythe said second portion `ofthe shaft, a 'cylindrical 4shaft'on said frame to guide a hollow driving'shaft, to permit of a movement of said frame, eccentrically with regard. to the axisgof rotationpof said "main shaft.v v i j .v

3. In a. .machinefor rectifying motor valve seats, comprising a: grinder performing a rapid rotary movement andalso aL slow movement eccentric with regard to the axis of the valve seat, a casing, bearings integral with. the casing, a main shaft journalled in said bearings, means to drive said .shaft A.witha slow rotary' movement concentric withsaid bearingstwo eccentric portionsonsaid shaft, a grinder SuppOrt mounted on one of said Leccentric portionsgvmeans'for driv- .ingsaidgrinder. supportl with' a. rapid rotary movement, a .part carrying the means driving the said shaft and the Agrinder and mountedon tothe said second eccentric portion of the said shaft, a wormf driven by a pinion, and another pinion meshing withit and keyedr to the hollow Y ,50 4.A In a Amachine for rectifying motor valve seats, 'comprising a grinder performing ya rapid rotary movement and also a 'slow movement eccentricwith regard to the axis ofthe valve seat, a casing, bearings in this casing, a1r main vshaft journalled in said bearings, means to drive this shaft with a rotary'n'iover'nentfslow and concentric with said bearings, twol eccentric portions on said shaft, a' grinder vsupport mounted on [one o f said eccentric' portions, meanstoWdrve vsaid v160 grinder support with a rapid rotary movement, a` part to carry the means vdriving s aid shaft 'and said grinder and mountedon the said second eccentric portion, the `said part comprising fa frameprovided'with two'sleeves traversed by the 65 said secondshaft portion, a vcylindrical shaft on said frameto guide aholl'ow driving shaft, to permit of an eccentric movement of 'said part shaft, the means 'driving' sfaid grindersupport, 70 consisting of a pinion provided on'the grinder support and meshing with a toothed crown pro- 'vided onine n ouow driving shaft.

5;-`In"f"armach ine `for 1 1e `:tifyir 1g'finotor valveI seats,`compri'sing a;v grinder performing a rapid "75 ,e

rotary movement and a slow movement eccentric with regard to the axis of the valve seat, a casing, bear-ings in this casing, a main shaft journalled in said bearings, means to drive this shaft with a slow rotary movement concentric with said bearings, two eccentric portions on said shaft, a grinder support mounted to one of said eccentric portions, means to drive said grinder support with a rapid rotary movement, a part to carry the means ydriving the shaft andthe grinder and mounted on the said second eccentric portion, said vpart comprising a frame provided with two y sleeves traversed by the said second shaft portion,

, a cylindrical shaft on said part'to guide a hollow driving shaft so as to ensure an eccentricrnovement of the said part with regard to the rotation axis of thesaid main shaft, the hollow shaft efecting with said part a to and fro movement transverse with regard to the main shaft and an alternatingangular movement, a bush provided with two pivots being xed in one of the handles, for. receiving the said hollow shaft pivoting with it andsliding therein.

6. In a machine for rectifying motor valve seats, comprising avgrinder performing a rapid rotary movement and a slow movement eccentric with regard to the axis of the valve seat, a casing, bearings in this casing, a main shaft journalled in said bearings, means to drive said shaft with a rotarymovement concentric with said bearing, twor eccentric lportions on said shaft, a grinder support mounted on one o said eccentric portions, means to drive said grindersupport with a rapid rotary movement, a part to carry the meansI driving the shaft and the grinder and mounted on'the'said second eccentric portion of the shaft, the said partv comprising a frame provided with two sleeves traversed by the rsaid second eccentric portion of the shaft, a cylindrical shaft on said part to serve as a guide for a hollow driving shaft, l

to ensure an eccentric movement of said part with regard to the axis of rotation of the said main shaft, this main shaft being hollow for rev ceiving a centering rod xed in the guide of the valve to be trued.

' PAUL KOSTER, 

